What happens when wood burns ? āĻāĻžāĻ āĻā§āĻŦāϞāĻŋāϞ⧠āĻāĻŋ āĻšāϝāĻŧ ?
Easy Notes for kids
- Burning is called Combustion : āĻā§āĻŦāϞāĻž āĻŽāĻžāύ⧠Combustion (ā§°āĻžāϏāĻžāϝāĻŧāύāĻŋāĻ āĻĒā§ā§°āĻā§ā§°āĻŋāϝāĻŧāĻž)
- Wood burns with oxygen in the air : āĻāĻžāĻ ā§ āĻŦāĻžāϝāĻŧā§ā§° āĻ āĻā§āϏāĻŋāĻā§āύ⧰ āϏā§āϤ⧠āĻā§āĻŦāϞā§
- It gives heat and light. : āĻ āϤāĻžāĻĒ āĻā§°ā§ āĻĒā§āĻšā§° āĻĻāĻŋāϝāĻŧā§
- Wood changes into ash, smoke, and gases : āĻāĻžāĻ āĻāĻžāĻ, āϧā§āĻā§ąāĻž āĻā§°ā§ āĻā§āĻāϞ⧠āĻĒā§°āĻŋāĻŦāϰā§āϤāύ āĻšāϝāĻŧ
- Gases like carbon dioxide (COâ) come out : āĻāĻžā§°ā§āĻŦāύ āĻĄāĻžāĻāĻ āĻā§āϏāĻžāĻāĻĄ (COâ) āĻĻā§°ā§ āĻā§āĻ āĻāϞāĻžāĻ āϝāĻžāϝāĻŧ
- Smoke is made of tiny particles + gases : āϧā§āĻā§ąāĻž = āϏ⧰⧠āĻāĻŖāĻž + āĻā§āĻ
- Sometimes we hear “crack” sound when wood burns : āĻā§āϤāĻŋāϝāĻŧāĻžāĻŦāĻž “āĻāĻŋāĻā§ āĻāĻŋāĻā§” āĻļāĻŦā§āĻĻ āĻļā§āύāĻž āϝāĻžāϝāĻŧ
Simple Idea: Burning → Wood changes → Heat + Light + Smoke + Gas : āϏāĻšāĻ āϧāĻžā§°āĻŖāĻž: āĻā§āĻŦāϞāĻž → āĻāĻžāĻ āϏāϞāύāĻŋ āĻšāϝāĻŧ → āϤāĻžāĻĒ + āĻĒā§āĻšā§° + āϧā§āĻā§ąāĻž + āĻā§āĻ
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āĻā§āĻŦāϞāĻž āĻāĻāĻž ā§°āĻžāϏāĻžāϝāĻŧāύāĻŋāĻ āĻĒā§ā§°āĻā§ā§°āĻŋāϝāĻŧāĻž, āϝāĻžāĻ Combustion āĻŦā§āϞāĻŋ āĻā§ā§ąāĻž āĻšāϝāĻŧ, āϝ’āϤ āĻāĻžāĻ ā§ āĻŦāĻžāϝāĻŧā§āϤ āĻĨāĻāĻž āĻ
āĻā§āϏāĻŋāĻā§āύ (Oâ)ā§° āϏā§āϤ⧠āĻĒā§ā§°āϤāĻŋāĻā§ā§°āĻŋāϝāĻŧāĻž āĻā§°ā§āĨ¤ āĻāĻ āĻĒā§ā§°āĻā§ā§°āĻŋāϝāĻŧāĻžāϤ āϤāĻžāĻĒ āĻā§°ā§ āĻĒā§āĻšā§° āĻā§āĻĒāύā§āύ āĻšāϝāĻŧ āĻā§°ā§ āĻāĻžāĻ āϏ⧰⧠āϏ⧰⧠āĻĒāĻĻāĻžā§°ā§āĻĨāϞ⧠āĻāĻžāĻāĻŋ āϝāĻžāϝāĻŧāĨ¤
When wood burns, it releases different gases such as carbon dioxide (COâ), water vapor (steam), and sometimes carbon monoxide (CO). These gases come out because the material is changing into new substances during burning.
āĻāĻžāĻ āĻā§āĻŦāϞāĻŋāϞ⧠āĻāĻžā§°ā§āĻŦāύ āĻĄāĻžāĻāĻ āĻā§āϏāĻžāĻāĻĄ (COâ), āĻĒāĻžāύā§ā§° āĻŦāĻžāώā§āĻĒ āĻā§°ā§ āĻā§āϤāĻŋāϝāĻŧāĻžāĻŦāĻž āĻāĻžā§°ā§āĻŦāύ āĻŽāύā§āĻā§āϏāĻžāĻāĻĄ (CO) āĻĻā§°ā§ āĻŦāĻŋāĻāĻŋāύā§āύ āĻā§āĻ āύāĻŋā§°ā§āĻāϤ āĻšāϝāĻŧāĨ¤ āĻāĻāĻŦā§ā§° āĻā§āĻ āĻāϞāĻžāĻ āĻāĻšā§ āĻāĻžā§°āĻŖ āĻā§āĻŦāϞāĻžā§° āϏāĻŽāϝāĻŧāϤ āĻĒāĻĻāĻžā§°ā§āĻĨ āύāϤā§āύ āĻĒāĻĻāĻžā§°ā§āĻĨāϞ⧠⧰ā§āĻĒāĻžāύā§āϤ⧰āĻŋāϤ āĻšāϝāĻŧāĨ¤
Along with gases, smoke is also produced. Smoke contains very tiny solid particles mixed with gases. The bad smell we feel comes from partially burned (unburnt) chemicals present in the wood.
āĻā§āĻā§° āϏā§āϤ⧠āϧā§āĻā§ąāĻžāĻ āĻā§āĻĒāύā§āύ āĻšāϝāĻŧāĨ¤ āϧā§āĻā§ąāĻžāϤ āĻ āϤāĻŋ āϏ⧰⧠āĻāĻ āĻŋāύ āĻāĻŖāĻž āĻā§°ā§ āĻā§āĻ āĻŽāĻŋāĻšāϞāĻŋ āĻšā§ āĻĨāĻžāĻā§āĨ¤ āĻāĻŽāĻŋ āϝāĻŋ āĻŦā§āϝāĻŧāĻž āĻāύā§āϧ āĻ āύā§āĻā§ą āĻā§°ā§āĻ, āϏā§āϝāĻŧāĻž āĻ āĻĒā§ā§°ā§āĻŖāĻāĻžā§ąā§ āĻā§āĻŦāϞāĻž ā§°āĻžāϏāĻžāϝāĻŧāύāĻŋāĻ āĻĒāĻĻāĻžā§°ā§āĻĨā§° āĻŦāĻžāĻŦā§ āĻšāϝāĻŧāĨ¤
Sometimes, we hear cracking sounds while wood burns. This happens because heat causes the air and moisture trapped inside the wood to expand. As these gases escape quickly, they produce sound and more smoke.
āĻā§āϤāĻŋāϝāĻŧāĻžāĻŦāĻž āĻāĻžāĻ āĻā§āĻŦāϞāĻžā§° āϏāĻŽāϝāĻŧāϤ “āĻāĻŋāĻā§ āĻāĻŋāĻā§” āϧ⧰āĻŖā§° āĻļāĻŦā§āĻĻ āĻļā§āύāĻž āϝāĻžāϝāĻŧāĨ¤ āĻāĻāĻā§ āĻšāϝāĻŧ āĻāĻžā§°āĻŖ āϤāĻžāĻĒā§ āĻāĻžāĻ ā§° āĻāĻŋāϤ⧰āϤ āĻĨāĻāĻž āĻŦāĻžāϝāĻŧā§ āĻā§°ā§ āĻĒāĻžāύ⧠āĻĢā§āϞāĻžāϝāĻŧāĨ¤ āĻāĻ āĻā§āĻāĻŦā§ā§° āϤā§āĻā§āώāĻŖāĻžāϤ āĻāϞāĻžāĻ āϝāĻžāĻāĻāϤ⧠āĻļāĻŦā§āĻĻ āĻā§°ā§ āĻ āϧāĻŋāĻ āϧā§āĻā§ąāĻž āϏā§āώā§āĻāĻŋ āĻā§°ā§āĨ¤
Idea (āϧāĻžā§°āĻŖāĻž)
- Burning → material breaks → gas + smoke come out
- āĻā§āĻŦāϞāĻž → āĻĒāĻĻāĻžā§°ā§āĻĨ āĻāĻžāĻā§ → āĻā§āĻ āĻā§°ā§ āϧā§āĻā§ąāĻž āĻāϞāĻžāĻ āϝāĻžāϝāĻŧ
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MCQs (Exam Practice)
Q1. Burning is called:
A. Freezing B. Melting C. Combustion D. Boiling
Ans: C (Combustion)
Q2. Wood reacts with which gas during burning ?
A. Nitrogen B. Oxygen C. Hydrogen D. Helium
Ans: B (Oxygen) : āĻāϤā§āϤ⧰: B (āĻ āĻā§āϏāĻŋāĻā§āύ)
Q3. Which gas is produced when wood burns ?
A. Oxygen B. Carbon dioxide C. Nitrogen D. Helium
Ans: B (Carbon dioxide) : āĻāϤā§āϤ⧰: B (āĻāĻžā§°ā§āĻŦāύ āĻĄāĻžāĻāĻ āĻā§āϏāĻžāĻāĻĄ)
Q4. Smoke contains:
A. Only air B. Only water C. Tiny particles + gases D. Only oxygen
Ans: C. Tiny particles + gases : āĻāϤā§āϤ⧰: C (āϏ⧰⧠āĻāĻŖāĻž + āĻā§āĻ)
Q5. Why do we hear cracking sound ?
A. Cold B. Because of water
C. Due to expanding air inside wood D. Due to wind
Ans: C. Due to expanding air inside wood : āĻāϤā§āϤ⧰: C (āĻŦāĻžāϝāĻŧā§ āĻĢā§āϞāĻžā§° āĻŦāĻžāĻŦā§)
Exam Ans
When wood burns, it undergoes a chemical process called combustion. Wood reacts with oxygen in the air and produces heat and light. During this process, wood breaks into simpler substances and releases gases like carbon dioxide, water vapor, and carbon monoxide. Smoke is also produced, which contains tiny particles and gases. The cracking sound is due to the expansion of air inside the wood.
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